Currently in my first year teaching in an urban school. It's hard to describe how physically/mentally/emotionally draining it is. I went through an alternate certification program and was put in front of a class after a six week summer program. I am amazed that this is acceptable.
See for example http://www.salon.com/2013/08/26/school_is_a_prison_and_damag...
Despite your best intentions, coercive schooling is not a good thing. There are better ways, such as Sudbury schooling, that are both respectful of children and actually prepare them for the world that we live in.